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Scholtz J, Wichmann J, Bennett D, Leithner D, Albrecht M, Bucher A, Bauer R, Vogl T, Bodelle B. Diagnostic accuracy for detection of intracranial hemorrhage using automatic tube current modulation and advanced modeled iterative reconstruction in unenhanced head single-energy and dual-energy CT. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600409] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- J Scholtz
- Massachusetts General Hospital, Division of Cardiovascular Imaging, Boston
| | - J Wichmann
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - D Bennett
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - D Leithner
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - M Albrecht
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - A Bucher
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - R Bauer
- Kantonspital St. Gallen, Klinik für Radiologie und Nuklearmedizin, St. Gallen/Schweiz
| | - T Vogl
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
| | - B Bodelle
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt/Main
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Bucher A, Scholtz J, Kohle C, Albrecht M, Kaup M, Vogl T, Bodelle B. Intra-individueller Vergleich zwischen Ultra-Low-Dose und Standard-Dosis CT der Lumbalwirbelsäule bei 150 kV mit Zinn-Filter: CT Untersuchungen unterhalb der Dosis eines konventionellen Röntgenbildes. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600358] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- A Bucher
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - J Scholtz
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - C Kohle
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - M Albrecht
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - M Kaup
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - T Vogl
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - B Bodelle
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
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Leithner D, Wichmann J, Vogl T, Trommer J, Martin S, Scholtz J, Bodelle B, De Cecco C, Duguay T, Nance J, Schoepf J, Albrecht M. Virtuelle monoenergetische Rekonstruktionen und Jodperfusionskarten verbessern die diagnostische Genauigkeit der Dual-Energy CT Pulmonalangiografie mit suboptimalen Kontrastverhältnissen. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- D Leithner
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - J Wichmann
- Universitätsklinikum Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - T Vogl
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - J Trommer
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - S Martin
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - J Scholtz
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - B Bodelle
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
| | - C De Cecco
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston
| | - T Duguay
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston
| | - J Nance
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston
| | - J Schoepf
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston
| | - M Albrecht
- Universitätsklinikum Frankfurt am Main, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt am Main
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Bucher A, Albrecht M, Vogl T, Martin S, Beeres M, Bodelle B, Scholtz J. 70-kVp CT-Untersuchung des Halses zur Lymphomabklärung und Verlaufskontrolle: Beurteilung der Bildqualität und Strahlendosis. ROFO-FORTSCHR RONTG 2017. [DOI: 10.1055/s-0037-1600431] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
Affiliation(s)
- A Bucher
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - M Albrecht
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - T Vogl
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - S Martin
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - M Beeres
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - B Bodelle
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
| | - J Scholtz
- Uniklinik Frankfurt, Institut für Diagnostische und Interventionelle Radiologie, Frankfurt
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Albrecht MH, Bodelle B, Varga-Szemes A, Dewes P, Bucher AM, Ball BD, De Cecco CN, Schoepf UJ, Zhu X, Zangos S, Gruber-Rouh T, Wichmann JL, Lehnert T, Vogl TJ. Intra-individual comparison of CAIPIRINHA VIBE technique with conventional VIBE sequences in contrast-enhanced MRI of focal liver lesions. Eur J Radiol 2016; 86:20-25. [PMID: 28027748 DOI: 10.1016/j.ejrad.2016.10.025] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2016] [Revised: 10/20/2016] [Accepted: 10/22/2016] [Indexed: 01/18/2023]
Abstract
PURPOSE To evaluate the impact of controlled aliasing in parallel imaging results in higher acceleration (CAIPIRINHA) volume interpolated breath-hold examination (VIBE) magnetic resonance imaging (MRI) technique on image quality, reader confidence, and inter-observer agreement for the assessment of focal liver lesions in comparison with the standard VIBE approach. MATERIAL AND METHODS In this IRB-approved intra-individual comparison study, abdominal arterial and portal-venous contrast-enhanced MRI studies were retrospectively analyzed in 38 patients with malignant liver lesions. Each patient underwent both CAIPIRINHA and conventional VIBE 3T MRI within 3 months, showing stable disease. Images were evaluated using 5-point rating scales by two blinded radiologists with more than 20 and 5 years of experience in MRI, respectively. Readers scored dignity of liver lesions and assessed which liver segments were affected by malignancy (ranging from 1=definitely benign/not affected to 5=definitely malignant/affected by malignancy). Readers also rated overall image quality, sharpness of intrahepatic veins, and diagnostic confidence (ranging from 1=poor to 5=excellent). RESULTS Reviewers achieved a higher inter-observer reliability using CAIPIRINHA when they reported which liver segments were affected by malignancy compared to traditional VIBE series (κ=0.62 and 0.54, respectively, p<0.05). Similarly, CAIPIRINHA showed a slightly higher inter-rater agreement for the dignity of focal liver lesions versus the standard VIBE images (κ=0.50 and 0.49, respectively, p<0.05). CAIPIRINHA series also scored higher in comparison to standard VIBE sequences (mean scores: image quality, 4.2 and 3.5; sharpness of intrahepatic vessels, 3.8 and 3.2, respectively, p<0.05) for both reviewers and allowed for higher subjective diagnostic confidence (ratings, 3.8 and 3.2, respectively, p<0.05). CONCLUSION Compared to the standard VIBE approach, CAIPIRINHA VIBE technique provides improved image quality and sharpness of intrahepatic veins, as well as higher diagnostic confidence. Additionally, this technique allows for higher inter-observer agreement when reporting focal liver lesions for both dignity and allocation.
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Affiliation(s)
- M H Albrecht
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany; Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC, USA.
| | - B Bodelle
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - A Varga-Szemes
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC, USA.
| | - P Dewes
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - A M Bucher
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - B D Ball
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC, USA.
| | - C N De Cecco
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC, USA.
| | - U J Schoepf
- Medical University of South Carolina, Department of Radiology and Radiological Science, Charleston, SC, USA.
| | - X Zhu
- Shihezi University, Department of Psychology, Beisi Road, Xinjiang, China.
| | - S Zangos
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - T Gruber-Rouh
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - J L Wichmann
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - T Lehnert
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
| | - T J Vogl
- University Hospital Frankfurt, Department of Diagnostic and Interventional Radiology, Frankfurt,Germany.
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Leithner D, Albrecht M, Scholtz J, Martin S, Lehnert T, Beeres M, Bodelle B, Bucher A, Schoepf U, Bauer R, Vogl T, Wichmann J. Dual-Energy CT mit rauschoptimierten virtuellen monoenergetischen Rekonstruktionen verbessert die diagnostische Genauigkeit in der Erkennung von Pfortaderthrombosen. ROFO-FORTSCHR RONTG 2016. [DOI: 10.1055/s-0036-1581400] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Leithner D, Albrecht M, Wichmann J, Bodelle B, Bauer R, Dewes P, Bucher A, Roberts D, Zangos S, Lehnert T, Vogl T. Auswirkungen der CAIPIRINHA VIBE auf Interobserver Reliabilität im Vergleich zu konventionellen VIBE Sequenzen in kontrastverstärkter MRT fokaler Leberläsionen. ROFO-FORTSCHR RONTG 2016. [DOI: 10.1055/s-0036-1581306] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Scholtz JE, Kaup M, Hüsers K, Albrecht MH, Bodelle B, Metzger SC, Kerl JM, Bauer RW, Lehnert T, Vogl TJ, Wichmann JL. Advanced Modeled Iterative Reconstruction in Low-Tube-Voltage Contrast-Enhanced Neck CT: Evaluation of Objective and Subjective Image Quality. AJNR Am J Neuroradiol 2016; 37:143-50. [PMID: 26427836 DOI: 10.3174/ajnr.a4502] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/04/2015] [Accepted: 06/10/2015] [Indexed: 01/18/2023]
Abstract
BACKGROUND AND PURPOSE Dose-saving techniques in neck CT cause increased image noise that can be counteracted by iterative reconstruction. Our aim was to evaluate the image quality of advanced modeled iterative reconstruction (ADMIRE) in contrast-enhanced low-tube-voltage neck CT. MATERIALS AND METHODS Sixty-one patients underwent 90-kV(peak) neck CT by using third-generation 192-section dual-source CT. Image series were reconstructed with standard filtered back-projection and ADMIRE strength levels 1, 3, and 5. Attenuation and noise of the sternocleidomastoid muscle, internal jugular vein, submandibular gland, tongue, subscapularis muscle, and cervical fat were measured. Signal-to-noise and contrast-to-noise ratios were calculated. Two radiologists assessed image noise, image contrast, delineation of smaller structures, and overall diagnostic acceptability. Interobserver agreement was calculated. RESULTS Image noise was significantly reduced by using ADMIRE compared with filtered back-projection with the lowest noise observed in ADMIRE 5 (filtered back-projection, 9.4 ± 2.4 Hounsfield units [HU]; ADMIRE 1, 8.3 ± 2.8 HU; ADMIRE 3, 6.7 ± 2.0 HU; ADMIRE 5, 5.4 ± 1.7 HU; all, P < .001). Sternocleidomastoid SNR and internal jugular vein-sternocleidomastoid contrast-to-noise ratios were significantly higher for ADMIRE with the best results in ADMIRE 5 (all, P < .001). Subjective image quality and image contrast of ADMIRE 3 and 5 were consistently rated better than those for filtered back-projection and ADMIRE 1 (all, P < .001). Image noise was rated highest for ADMIRE 5 (all, P < .005). Delineation of smaller structures was voted higher in all ADMIRE strength levels compared with filtered back-projection (P < .001). Global interobserver agreement was good (0.75). CONCLUSIONS Contrast-enhanced 90-kVp neck CT is feasible, and ADMIRE 5 shows superior objective image quality compared with filtered back-projection. ADMIRE 3 and 5 show the best subjective image quality.
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Affiliation(s)
- J-E Scholtz
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - M Kaup
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - K Hüsers
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - M H Albrecht
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - B Bodelle
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - S C Metzger
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - J M Kerl
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - R W Bauer
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - T Lehnert
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - T J Vogl
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - J L Wichmann
- From the Department of Diagnostic and Interventional Radiology (J.-E.S., M.K., K.H., M.H.A., B.B., S.C.M., J.M.K., R.W.B., T.L., T.J.V., J.L.W.), University Hospital Frankfurt, Frankfurt, Germany Department of Radiology and Radiological Science (J.L.W.), Medical University of South Carolina, Charleston, South Carolina
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Bodelle B, Isler S, Scholtz JE, Frellesen C, Luboldt W, Vogl TJ, Beeres M. Benefits of sinogram-affirmed iterative reconstruction in 0.4 mSv ultra-low-dose CT of the upper abdomen following transarterial chemoembolisation: comparison to low-dose and standard-dose CT and filtered back projection technique. Clin Radiol 2015; 71:e11-5. [PMID: 26521185 DOI: 10.1016/j.crad.2015.10.001] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2015] [Revised: 09/30/2015] [Accepted: 10/01/2015] [Indexed: 12/16/2022]
Abstract
AIM To evaluate the advantage of sinogram-affirmed iterative reconstruction (SIR) compared to filtered back projection (FBP) in upper abdomen computed tomography (CT) after transarterial chemoembolisation (TACE) at different tube currents. MATERIALS AND METHODS The study was approved by the institutional review board. Written informed consent was obtained from all patients. Post-TACE CT was performed with different tube currents successively varied in four steps (180, 90, 45 and 23 mAs) with 40 patients per group (mean age: 60±12 years, range: 23-85 years, sex: 70 female, 90 male). The data were reconstructed with standard FBP and five different SIR strengths. Image quality was independently rated by two readers on a five-point scale. High (Lipiodol-to-liver) as well as low (liver-to-fat) contrast-to-noise ratios (CNRs) were intra-individually compared within one dose to determine the optimal strength (S1-S5) and inter-individually between different doses to determine the possibility of dose reduction using the Kruskal-Wallis test. RESULTS Subjective image quality and objective CNR analysis were concordant: intra-individually, SIR was significantly (p<0.001) superior to FBP. Inter-individually, regarding different doses (180 versus 23 ref mAs), there was no significant (p=1.00) difference when using S5 SIR at 23 mAs instead of FBP. CONCLUSION SIR allows for an 88% dose reduction from 3.43 to 0.4 mSv in unenhanced CT of the liver following TACE without subjective or objective loss in image quality.
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Affiliation(s)
- B Bodelle
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany.
| | - S Isler
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - J-E Scholtz
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - C Frellesen
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - W Luboldt
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - T J Vogl
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - M Beeres
- Department of Diagnostic and Interventional Radiology, Goethe University, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
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Bodelle B, Wichmann JL, Klotz N, Lehnert T, Vogl TJ, Luboldt W, Schulz B. Seventy kilovolt ultra-low dose CT of the paranasal sinus: first clinical results. Clin Radiol 2015; 70:711-5. [PMID: 25912259 DOI: 10.1016/j.crad.2015.03.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/09/2015] [Revised: 03/06/2015] [Accepted: 03/13/2015] [Indexed: 10/23/2022]
Abstract
AIM To evaluate the diagnostic image quality and radiation dose of low-dose 70 kV computed tomography (CT) of the paranasal sinus in comparison to 100 and 120 kV CT. MATERIALS AND METHODS CT of the paranasal sinus was performed in 127 patients divided into three groups using different tube voltages and currents (70 kV/75 mAs, ultra-low dose protocol, n = 44; 100 kV/40 mAs, standard low-dose protocol, n = 42; 120 kV/40 mAs, standard protocol, n = 41). CT dose index (CTDIvol), dose-length product (DLP), attenuation, image noise and signal-to-noise ratio (SNR) were compared between the groups using Wilcoxon-Mann-Whitney U-test. Subjective diagnostic image quality was compared by using a five-point scale (1 = non-diagnostic, 5 = excellent, read by two readers in consensus) and Cohen's weighted kappa analysis for interobserver agreement. RESULTS Radiation dose was significantly lower with 70 kV acquisition than 100 and 120 kV (DLP: 31 versus 52 versus 82 mGy·cm; CTDI 2.33 versus 3.95 versus 6.31 mGy, all p < 0.05). Mean SNR (70 kV: 0.37; 100 kV: 0.21; 120 kV: 0.13; p < 0.05) and organ attenuation increased significantly with lower voltages. All examinations showed diagnostic image quality. Subjective diagnostic image quality was higher with standard protocols than the 70 kV protocol (120 kV: 5.0; 100 kV: 4.5; 70 kV: 3.5, p < 0.05) without significant differences with substantial interobserver agreement (κ > 0.59). CONCLUSION The ultra-low dose (70 kV) CT imaging of the paranasal sinus allowed for significant dose reduction by 61% and an increased attenuation of organ structures in comparison to standard acquisition while maintaining diagnostic image quality with a slight reduction in subjective image quality.
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Affiliation(s)
- B Bodelle
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany.
| | - J L Wichmann
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - N Klotz
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - T Lehnert
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - T J Vogl
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - W Luboldt
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
| | - B Schulz
- Department of Diagnostic and Interventional Radiology, Goethe University of Frankfurt, Theodor-Stern-Kai 7, 60590 Frankfurt, Germany
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Wichmann JL, Kraft J, Nöske EM, Bodelle B, Burck I, Scholtz JE, Frellesen C, Wagenblast J, Kerl JM, Bauer RW, Lehnert T, Vogl TJ, Schulz B. Low-tube-voltage 80-kVp neck CT: evaluation of diagnostic accuracy and interobserver agreement. AJNR Am J Neuroradiol 2014; 35:2376-81. [PMID: 25104285 DOI: 10.3174/ajnr.a4052] [Citation(s) in RCA: 25] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Abstract
BACKGROUND AND PURPOSE Low-tube-voltage acquisition has been shown to facilitate substantial dose savings for neck CT with similar image contrast compared with standard 120-kVp acquisition. However, its potential for the detection of neck pathologies is uncertain. Our aim was to evaluate the effects of low-tube-voltage 80-kV(peak) acquisitions for neck CT on diagnostic accuracy and interobserver agreement. MATERIALS AND METHODS Three radiologists individually analyzed 80-kVp and linearly blended 120-kVp image series of 170 patients with a variety of pathologies who underwent dual-energy neck CT. Reviewers were unblinded to the clinical indication for CT but were otherwise blinded to any other data or images and were asked to state a final main diagnosis. Findings were compared with medical record charts, CT reports, and pathology results. Sensitivity, specificity, positive predictive value, and negative predictive value were calculated for each observer. Interobserver agreement was evaluated by using intraclass correlation coefficients. RESULTS Diagnoses were grouped as squamous cell carcinoma-related (n = 107, presence/absence of primary/recurrent squamous cell carcinoma), lymphoma-related (n = 40, presence/absence of primary/recurrent lymphoma), and benign (n = 23, eg, abscess). Cumulative sensitivity, specificity, positive predictive value, and negative predictive value for 80-kVp and blended 120-kVp images were 94.8%, 93.0%, 95.9%, and 91.1%, respectively. Results were also consistently high for squamous cell carcinoma-related (94.8%/95.3%, 89.1%/89.1%, 94.3%/94.4%, 90.1%/91.0%) and lymphoma-related (95.0%, 100.0%, 100.0%, 95.2%) 80-kVp/120-kVp image series. Global interobserver agreement was almost perfect (intraclass correlation coefficient, 0.82, 0.80; 95% CI, 0.76-0.74, 0.86-0.85). Calculated dose-length product was reduced by 48% with 80-kVp acquisitions compared with the standard 120-kVp scans (135.5 versus 282.2 mGy × cm). CONCLUSIONS Low-tube-voltage 80-kVp CT of the neck provides sufficient image quality with high diagnostic accuracy in routine clinical practice and has the potential to substantially decrease radiation exposure.
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Affiliation(s)
- J L Wichmann
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - J Kraft
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - E-M Nöske
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - B Bodelle
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - I Burck
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - J-E Scholtz
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - C Frellesen
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - J Wagenblast
- Otolaryngology, Head and Neck Surgery (J.W.), University Hospital Frankfurt, Frankfurt, Germany
| | - J M Kerl
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - R W Bauer
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - T Lehnert
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - T J Vogl
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
| | - B Schulz
- From the Departments of Diagnostic and Interventional Radiology (J.L.W., J.K., E.-M.N., B.B., I.B., J.-E.S, C.F., J.M.K., R.W.B., T.L., T.J.V., B.S.)
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Bodelle B, Klein E, Naguib NNN, Bauer RW, Kerl JM, Al-Butmeh F, Wichmann JL, Ackermann H, Lehnert T, Vogl TJ, Schulz B. Acute intracranial hemorrhage in CT: benefits of sinogram-affirmed iterative reconstruction techniques. AJNR Am J Neuroradiol 2014; 35:445-9. [PMID: 24263695 DOI: 10.3174/ajnr.a3801] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE Acute intracranial hemorrhage represents a severe and time critical pathology that requires precise and quick diagnosis, mainly by performing a CT scan. The purpose of this study was to compare image quality and intracranial hemorrhage conspicuity in brain CT with sinogram-affirmed iterative reconstruction and filtered back-projection reconstruction techniques at standard (340 mAs) and low-dose tube current levels (260 mAs). MATERIALS AND METHODS A total of 94 consecutive patients with intracranial hemorrhage received CT scans either with standard or low-dose protocol by random assignment. Group 1 (n=54; mean age, 64 ± 20 years) received CT at 340 mAs, and group 2 (n=40; mean age, 57 ± 23 years) received CT at 260 mAs. Images of both groups were reconstructed with filtered back-projection reconstruction and 5 iterative strengths (S1-S5) and ranked blind by 2 radiologists for image quality and intracranial hemorrhage on a 5-point scale. Image noise, SNR, dose-length product (mGycm), and mean effective dose (mSv) were calculated. RESULTS In both groups, image quality and intracranial hemorrhage conspicuity were rated subjectively with an excellent/good image quality. A higher strength of sinogram-affirmed iterative reconstruction showed an increase in image quality with a difference to filtered back-projection reconstruction (P < .05). Subjective rating showed the best score of image quality and intracranial hemorrhage conspicuity achieved through S3/S4-5. Objective analysis of image quality showed in an increase of SNR with a higher strength of sinogram-affirmed iterative reconstruction. Patients in group 2 (mean: 744 mGycm/1.71 mSv) were exposed to a significantly lower dose than those in group 1 (mean: 1045 mGycm/2.40 mSv, P < .01). CONCLUSIONS S3 provides better image quality and visualization of intracranial hemorrhage in brain CT at 260 mAs. Dose reduction by almost one-third is possible without significant loss in diagnostic quality.
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Affiliation(s)
- B Bodelle
- From the Departments of Diagnostic and Interventional Radiology (B.B., E.K., N.N.N.N., R.W.B., J.M.K., F.A.-B., J.L.W., T.L., T.J.V., B.S.)
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Schulz B, Bodelle B, Lehnert T, Al-Butmeh F, Sedlmair M, Banckwitz R, Klement D, Vogl TJ, Kerl MJ. 70 kV Computertomografie des Thorax: Strahlendosis und Wertigkeit für Computer assistierte Detektion und Evaluation von Lungenknoten - erste klinische Ergebnisse. ROFO-FORTSCHR RONTG 2013. [DOI: 10.1055/s-0033-1346333] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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Schulz B, Beeres M, Bodelle B, Bauer R, Al-Butmeh F, Thalhammer A, Vogl TJ, Kerl JM. Performance of iterative image reconstruction in CT of the paranasal sinuses: a phantom study. AJNR Am J Neuroradiol 2012; 34:1072-6. [PMID: 23221946 DOI: 10.3174/ajnr.a3339] [Citation(s) in RCA: 50] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Abstract
BACKGROUND AND PURPOSE CT in low dose technique is the criterion standard imaging modality for evaluation of the paranasal sinus. Our aim was to evaluate the dose-reduction potential of a recently available sinogram-affirmed iterative reconstruction technique, regarding noise, image quality, and time duration when evaluating this region. MATERIALS AND METHODS CT was performed on a phantom head at different tube voltages (120 kV, 100 kV) and currents (100 mAs, 50 mAs, 25 mAs). Each protocol was reconstructed (in soft tissue and bony kernel) by using standard filtered back-projection and 5 different SAFIRE strengths, and image noise was evaluated. Subjective image quality was evaluated on noise-aligned image triplets acquired at tube currents of 100% (FBP), 50% (SAFIRE), and 25% (SAFIRE) by using a 5-point scale (1 = worst, 5 = best). The time duration for image reconstruction was noted for calculations with FBP and SAFIRE. RESULTS SAFIRE reduced image noise by 15%-85%, depending on the iterative strength, rendering kernel, and dose parameters. Noise reduction was stronger at a bone kernel algorithm both in 1- and 3-mm images (P < .05). Subjective quality evaluation of the noise-adapted images showed preference for those acquired at 100% tube current with FBP (4.7-5.0) versus 50% dose with SAFIRE (3.4-4.4) versus 25% dose with SAFIRE (2.0-3.1). The time duration for FBP image sets was 2.9-6.6 images per second versus SAFIRE with 0.9-1.6 images per second. CONCLUSIONS For CT of the paranasal sinus, SAFIRE algorithms are suitable for image-noise reduction. Because image quality decreases with dosage, careful choice of the appropriate iterative method is necessary to achieve an optimal balance between image noise and quality.
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Affiliation(s)
- B Schulz
- Department of Diagnostic and Interventional Radiology, Clinic of the Goethe University, Frankfurt, Germany.
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Kerl JM, Lehnert T, Schell B, Bodelle B, Beeres M, Jacobi V, Vogl TJ, Bauer R. Intravenöse Kontrastmittelapplikation bei High Pitch DSCT Pulmonalangiographie: Testbolus versus Bolustracking. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311179] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Kerl JM, Al Butmeh F, Schell B, Bodelle B, Beeres M, Jacobi V, Lehnert T, Vogl TJ, Bauer R. High-Pitch-Dual-Source CT Pulmonalisangiographie: Kontrastmittelreduktion bis auf 30ml Kontrastmittel. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311180] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gruber-Rouh T, Naguib N, Beeres M, Eichler K, Zangos S, Schell B, Nour-Eldin Mohammed N, Lehnert T, Bodelle B, Vogl TJ. Die transarterielle Chemoembolisation (TACE) als minimal-invasive lokoregionale Behandlungsmaßnahme bei irresektablen Lebermetastasen eines kolorektalen Karzinoms. ROFO-FORTSCHR RONTG 2012. [DOI: 10.1055/s-0032-1311212] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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Gruber-Rouh T, Bodelle B, Lee C, Naguib N, Nour-Eldin MN, Vogl TJ. Transarterielle Chemoembolisation (TACE) der Lebermetastasen eines malignen Melanoms: lokales Tumoransprechen und Überlebensdaten. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279197] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Bodelle B, Zangos S, Hübner F, Gruber-Rouh T, Eichler K, Mack MG, Schell B, Beeres M, Vogl TJ. MR-gesteuerte transgluteale Biopsie der Prostata bei Patienten mit Verdacht auf ein Prostatakarzinom. ROFO-FORTSCHR RONTG 2011. [DOI: 10.1055/s-0031-1279117] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Delcambre B, Bleuse A, Bodelle B, Catanzariti L, Delannoy JJ, Derreumaux LL, Farasse JC, Hennebo A, Lelieur X. [Value of a new dosage form of diclofenac in rheumatology]. Lille Med 1980; 25:49-50. [PMID: 6966361] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
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